http://www.nyu.edu/projects/sciabarra/essays/austrians.pdf
http://www.nyu.edu/projects/sciabarra/essays/rprev.htm
https://books.google.fr/books?id=VcGyAAAAQBAJ&pg=PA484&lpg=PA484&dq=ayn+rand+the+russian+radical+pdf&source=bl&ots=adNgkp8Qaf&sig=LjAanlyjEUFtzDI7vei0M-5E0b8&hl=fr&sa=X&ei=41oyVf3LOcPCOYT3gQg&ved=0CGAQ6AEwCQ#v=onepage&q=ayn%20rand%20the%20russian%20radical%20pdf&f=false
http://www.nyu.edu/projects/sciabarra/essays/rprev.htm
https://books.google.fr/books?id=VcGyAAAAQBAJ&pg=PA484&lpg=PA484&dq=ayn+rand+the+russian+radical+pdf&source=bl&ots=adNgkp8Qaf&sig=LjAanlyjEUFtzDI7vei0M-5E0b8&hl=fr&sa=X&ei=41oyVf3LOcPCOYT3gQg&ved=0CGAQ6AEwCQ#v=onepage&q=ayn%20rand%20the%20russian%20radical%20pdf&f=false